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    <title>第六章</title>
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    <h1>例题</h1>
    <h2><a href="定时跳转.html">（1）定时跳转</a></h2>
     <h2><a href="红绿灯.html">（2）红绿灯倒计时</a></h2>  
     <h2><a href="限时秒杀.html">（3）限时秒杀</a></h2> 
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